Though gurus have been an integral part of the ancient Hindu tradition, the celebration of a specific day purnima in their honour in the month of Ashadha has its roots in Buddhism and Jainism. Gurus no doubt got respectful mentions in the Rig Veda (hymn 4.5.6) and in the Upanishads (chapter 4.4 of the Chhandogya) and in chapter 3 of the Taittiriya or in chapter 6 of the Shvetashvatara.
